Fill in the blank with the most appropriate word.

The speaker ______ the audience with his fine speech.

impressed

The correct word to fill in the blank is impressed.

The word "impressed" means to make someone feel admiration or respect. It is the most appropriate word to use in this context, as it conveys the meaning of the speaker's speech having a positive effect on the audience.

The other options are not as appropriate.

• Suppressed means to put down or restrain something. This is not the right word to use, as it does not make sense to say that the speaker suppressed the audience with his fine speech.
• Depressed means to make someone feel sad or unhappy. This is not the right word to use, as it does not make sense to say that the speaker depressed the audience with his fine speech.
• Expressed means to show or communicate something. This is not the right word to use, as it does not convey the same meaning as "impressed."